My first coach came with the Carefree awning and worked well for 10 years. It had 5 holes for angle adjustment. I now have a Dometic on my new coach and it's not adjustable.
Here's something I think is important and might have to do with model levels. When I had my Carefree awning, it had the metal cover that consisted of about five aluminum panels (slats) that when the awning was closed, the slats rolled up to cover the awning. The end slat attached to the roof, so no material was exposed when the awning was closed.
On my Dometic, it has the metal cover, but it's a sold tube that the awning rolls up into. The problem is that there is about 4" of exposed awning material, where it attaches to the roof, that could be problematic.